Left Sidebar, Content, Right Sidebar

Hi,

I have a theme that currently has “Content, Sidebar, Sidebar” but I am trying to change the theme to “Left Sidebar, Content, Right Sidebar” Is this possible?

The coding that I have is:

#sidebar-primary {
overflow: hidden;
float: left;
width: 150px;
margin-left: 15px;
}

#content {
overflow: hidden;
float: left;
width: 590px;
margin: 0 auto;
}

.sidebar-primary #content,
.content #content {
width: 640px;
}

.content #content,
.sidebar-secondary #content {
float: right;
}

#sidebar-secondary {
overflow: hidden;
float: right;
width: 150px;
margin-left: 15px;
}

I’m a newb when using coding, so I’m not even sure if this is the right section to post.

Thank you for anyone’s help and I’m sorry if someone posted already! I have looked for days, but finally decided to post this question.